Seeking nylon grocery sacks that can be collapsed into tiny stuff-sacks that are attached inside the big bag.
Solids and patterns are both great, but if you have too many and don't know which to give, most especially useful are Blue/Teal, Green/Lime, Red/Rose/Burgundy, White, Pink/Peach, and patterned.
Specific colors isn't just about fashion - I use a color coded system to separate items for delivery to clients I serve from the food bank. Blue for Frozen, White for sundry, Green for produce, red for refridgerated, Multicolor/Patterns for pantry. Pink/Peach for pets.
This helps me speed through deliveries, get from house to house quickly, and allows those with neurodiverse mental engagement step in to help unload their stuff with me. It also helps me "shop" the food bank faster for everyone because I know exactly where to sort things without having to think it over.